Access Movieclip withing child

Howdi,

This is probably super simple, but for me… not!
I am loading external swf into my main swf.

How do I access a movieclip within a child. This is my code:

function loadFolio (event:MouseEvent) :void{
var request:URLRequest = new URLRequest(“folio.swf”);
contentLoad.load(request);
addChildAt(contentLoad,1);

in the folio.swf, there is a menu_mc which I need to access from the main.swf.

I tried with contentLoad.menu_mc.x=100; but it did not work.

Anyone got any clue. MANY THANX